Burner for burning metaldehyde



Apr.. '111923. V

1,452,450 c. ToMMAsl VET` AL `BURNER FOR BURNING METALDEHYDE F11-*ed July 19, 1921 Patented Apr. 17, 1923.

yUNETEU STATES.

1,452,450 sArsN'r ortica."

CARLO TOMMASI, JOHN SANDHOLM, HEINRTCH DANEEEL, AND AUGUSTO BUSCH, OF BASEL, SWITZERLAND, ASSIGNORS TO ELEKTRIZITATSWERK LONZA, OF GAMPEL, CANTON OF VALATS, S'LZERLANE, CORPORATION OE SWITZERLAND.

BURNER FOR BURNING METALDEHYDE.

Application led July 19, 1921,' Serial No. 485,950.

(GRANTED UNDER THE PROVISIONS 0F THE ACT 0F MAR-CH 3, 1921, 11 STAT. L., 1313.)

To all whom t may concern.

Be it known that we, CARLO ToMMAsi, a subject of theKing of Italy, JOHN SAND- HoLM, a citizen of the Republic of Finland, HEINRICH DANNEEL, a citizen of the German Republic, and AUeUs're BUSCH, a subiect of the King of lltaly, all residents of Basel, Switzerland, have invented a new and useful Burner for Burning Metaldehyde (for which applications have been filed;

in Switzerland on December 4L, 1919, and

1p1-il 24, 1920), of which the following is` respect to the upper edge of the protecting sheath, this retainer limiting the extent to which the fuel body protrudes fromfthe sheath.

Furthermore, the arrangement may be such that on the one hand the burner has a. device which tends to advance automatically the fuel body correspondingly with its consumption. and on the other hand the pro-` tecting sheath is formed of two-'coaxial relatively movable parts one of. which'has a retainer fixed to it to limit the extent to which the fuel ybody protrudes from the intense vfla-nie and then a smaller, as is de` sirable, for example, in the preparation of soup, the above specified protecting sheathl may be surrounded by a carrier in the form retainer which limits the extent to which the fuel protrudes from the sheath, may be carried by this cup-shaped carrier, and theA latter may be raised or lowered, by a screwing operation, in relation to the protecting sheath, or the cup-shaped carrier may be connected suitably with the sheath and the retainer may be formed of at least one metal wire extending through inclined slots in :i part of the said carrier.

,In order that while the large flame is burning the metal parts of the protecting sheath may not become hot enough to vaporize the fuel withinv it, they cup-shaped carrier and the sheath may be separated by material that is a bad conductor of heat, or parts of the` apparatus, such as the lower part of the said carrier or the sheath itself, or both, may be made of a material which is a bad conductor of heat.

Three examples of the construction aclcording to the invention `are shown in the accompanying drawing.

Figs. 1, 2 andB shew a first construction in vertical section, side elevation and plan respectively.

Fig. 4- shews a second construction partly in vertical section and partly in side elevation.

Fig. 5 shows a third construction in vertical section.

Referring to Figs. 143, A. is the fuel body of metaldehyde. B is the protecting sheath which surrounds a part of it and may be formed wholly or only as tov its' upper part of heat insulating material in order to hinder conduction of the heatyof 'the Haine to the lower 'parts of the burner. The spring C. bearing upon the footJ with which the sheath B is connected, presses through a plate D the fuel body A against a retainer E, consisting of a wire cross, which limits the extent to which the body A protrudes from the vsheath B. In this casev the retainer is fixed to the sheath and its adjustaloility with respect of the upper. edge of the Vsheath is obtained by making the latter in two parts, V

one of which can be moved coaxially on the other. Thus mounted on the sheath B is ring which are two oblique slots G engaging pins H fixed to the sheath, so that by partially rotating the ring the latter can be adjusted vertically on the sheath; thus the height of the portion of the fuel body, which always bears against the retainer E, protruding from the sheath, of which the ring l forms a part, can be varied. The foot J is connected with the sheath by a double bayonet joint l, 4L so that these parts can be separatedr for the purpose of the introducing the fuel body into the sheath.

ln Fig. e the fuel body il. is again partially surrounded by a protecting sheath and is pressed against the retainer E by the spring C acting through the plate D. The shea-th is formed of two concentric parts B,

lf of which B has the retainer E fixed to it and is connected with the foot J in'such a manner that it can be lifted from the foot. rlhe part F can slide vertically on the part B and is connected with the curling tongs carrier N. lllhen nothing rests on the carrier N, the part l1" has adpositiou in which it extends above the upper edge of part B and partially covers the protruding portion of the fuel body. l'vilhen, however, the curling tongs M are laid upon the carrier, the latter together with the outer part lf of the sheath is pushed downwards so that an increased surface of the fuel body is freely ex posed and thetla-me becomes correspondingly larger. `Then the tongs M are again removed from the carrier the latter and the parts F are again raised under action of springs P and the flame diminishes. In Fig. e the part F is shown in its lowest position.

The possibilities of construction are not exhausted by this example. rl`he outer sheath F for instance, may be immovable and the inner shea-th together with the fuel body, spring C and retainer E may be connected with the carrier N, such as by a lever device, so that'when the object to be heated `is put in place the fuel body is raised and its exposed surface increased, while when the object is removed the weight of .the fuel body causes it to return into the outer sheath and burn with a small flume. In this case also there would be two co-axial sheaths, the relative movement of which would b e determined vby the placing .in poi sition of the object to be heated and the size of rthe flame .thus regulated. i

In Fig. 5 the sheath l, closed at its lower end v,contains ,the lsolid fuel A and a spring .C in compression between the bottom of the sheath and a plate D on which the fuel is supported. The sheath is carried by a foot J on which 1s mounted, by means of a screw thread S, a perforated carrier T shaped like a cup and having the retaining wire E extending through two perforations in what may be called the neck t of the carrier; the fuel is pressed against this wire by spring c. lvVhen the carrier is turned on its axis simultaneously with the wire E" it is screwed up or down on the foot d and the extent of the surface of the fuel which can burn is thus adjusted.

The neck t of the carrier `is separated from the sheath B, almost throughout its height, by a space U and is perforated to ensure an ascending eurent of air in this space and thus to avoid or counteract transmission of heat to the sheath B through the screw connection A. layer of asbestos, of a mixture of Portland cei'uent with the bestes fibres, or other had conductor of heat may be arranged between the fuel ik and the seath B. rlhe neck t or the sheath B or both may also be made of glass, porcelain, a mixture of lortland cement with asbestos fibres, or any other suitable material which is a bad conductor of heat.

The wire E may be adjusted relatively to the upper edge of the sheath B in any other manner than that shown; for instance the screw thread El may be omitted and the wire may extend through inclined slots in the sheath B.

To start the burner, the vnecessary tablets of metaldehyde, judged from experience to be necessary for bringing to the boil the substance to be heated or cooked, are thrown on to the carrier T, and ignited. When these tablets have been consumed the surface of the body of fuel A protruding from the sheath will continue to burn, furnishing a smaller flame. Instead of the wire E there may be used one or more stirrups of wire fixed to the sheath or to the neck t or another part of the carrier T; or there may be several wires like E arranged parallel or crossing each other; or a metal gauze may be used.

`What we claim is: i

1. A burner for fuel bodies of metalde hyde wherein a part of the fuel body 1s surrounded by a protecting sheath and the fuel body and the upper edge of the sheath are so adjustable in relation to each other, that the size of the burning surface of the fuel body can be regulated.

2. A burner for fuel bodies of metaldehyde, having a protecting sheath surround.- ing a part of the fuel body, adevice which tends to push forward automatically the fuel body correspondingly with its consumption and a retainer, which limits the extent to which the fuel body protrudes from the sheath7 the said retainer and the upper edge of the protecting sheath being so adjustable in relation to each other, that the size of the burning surface of the fuel body can be regulated.

3. A burner for fuel bodies of metaldelll) hyde, having a protecting sheath surrounding a part of the fuel body, a device which tends to push forward automatically the fuel body correspondingly with its comsumption and a retainer, which limits the extent to which the fuel body protrudes from the sheath, the said retainer and 'the upper edge of the protecting sheath being so adjustable in relation to earch other, that the size of the burning surface of the fuel body can be regulated and the said protecting sheath being formed, at least near its upper edge, of a material which 1s a bad conductor of heat.

4;. A burner for fuel bodies of metaldeh vde wherein a part of the yfuel body is surrounded by a protecting sheath and the fuel body and the upper edge of the sheath are so adjustable in relation to each other, thatthe size of the burning surface of the fuel body can be regulated, the protecting sheath being formed, at least near its upper edge, of a material which is a bad conductor .of heat.

5. A burner for fuel bodies of metaldehyde having a protecting sheath surrounding a part of the fuel body, a cup-shaped carrier perforated for passage of'air, arranged around the protecting sheath and adapted to receive a supplementary supply of metaldehyde in the form of tablets or the like, a device which tends topush forward automatically the fuel body correspondingly with its consumption and a retainer for the said fuel body, mounted on the said cupshaped carrier and being vertically adjustable relatively to the upper edge of the protecting` sheath.

6. A burner for bodies of metaldehyde having a protecting sheath surrounding a part of the. fuel body, a cup-Shaped carrier perforated for passage of air, arranged around the protecting sheath and adapted to receive a supplementary supply of metaldehyde in the form of tablets or the like, a device which tends to push forward automatically the fuel body correspondingly with its consumption anc a retainer for the said fuel body, mounted on the said cupshapcd carrier and being' vertically adjustable relatively to the upper edge of the protecting sheath byV means of a screw thread connection between the cup-shaped carrier and. the protecting sheath.

7.. A burner for bodies of metaldehyde having a protecting sheath surrounding a of air,

partof the fuel body, a cup-shaped carrier perforated for passage of air, arranged around the protecting sheathI and adapted to receive a supplementary supply of metaldehyde in the form of tablets or the like, a device which tends to push forward automatically the fuel body correspondingly with .its consumption, a retainer for the fuel body, mounted on the said cup-shaped carrier, and being vertically adjustable relatively to the upper edge of the protecting sheath, and a layer of substance, which is a bad conductor of heat, separating the protecting sheath and the fuel body.

` 8. A burner for bodies of metaldehyde having a protecting sheath surrounding a part of a fuel body and constructed of a material which is a bad conductor of heat, a cup-shaped carrier perforated for passage Y arranged around the protecting sheath and adapted to receive a supplementary supply of meta-ldehyde in the form of tablets to push forward automatically the fuel body correspondingly with its consumption, and a retainer for the fuel body,mounted on. the said cup-shaped carrier, and being vertically adjustable relatively to the upper edge of the protecting sheath.

9. A burner for bodies k.of ,metaldehyde having a protecting sheath surrounding a part of a fuel body and constructed of a material which is a bad conductor of heat, a cup-shaped carrier, perforated for the passage of air, arranged around the protecting sheath and adapted to receive a supor the like, av device which tends.

plementary supply of metaldehyde in the form of tablets or the lilre and having'its lower part formed of a material which is a bad conductor of heat, a device which tends to push forward automatically the fuel body correspondingly with its consumption, and a retainer for the fuel body, mounted on the said cup-shaped carrier and being vertically adjustable relatively to the upper edge of the protecting sheath.

In witness whereof we have hereunto signed our name this 27th day of J une 1921, in the presence of two subscribing witnesses.

CARLO TOMMASI. JOHN SANDHOLM. y HEINRICH DANN EEL.

AUGUSTO BUSCH. Witnesses:

` -Fnroo KURZ,

AMAND RITTER. 

